# Copyright (c) 2007-2008 Roy Marples <roy@marples.name>
# Released under the 2-clause BSD license.

_config_vars="$_config_vars ssid mode associate_timeout preferred_aps"
_config_vars="$_config_vars blacklist_aps"

iwconfig_depend()
{
	program /sbin/ifconfig
	after plug
	before interface
	provide wireless
}

iwconfig_get_wep_status()
{
	local status="disabled"
	local mode=$(LC_ALL=C ifconfig "${IFACE}" \
	| sed -n -e 's/^[[:space:]]*authmode \([^ ]*\) privacy ON .*/\1/p')
	if [ -n "${mode}" ] ; then
		status="enabled - ${mode}"
	fi

	echo "(WEP ${status})"
}

_iwconfig_get()
{
	LC_ALL=C ifconfig "${IFACE}" | \
	sed -n -e "s/^[[:space:]]*ssid \(.*\) channel \([0-9]*\).* bssid \(..:..:..:..:..:..\)\$/\\$1/p"
}

_get_ssid()
{
	local ssid="$(_iwconfig_get 1)"
	# If the ssid has a space then it's wrapped in quotes. This is a
	# problem if the real ssid has a quote at the start or the end :/
	ssid=${ssid#\"}
	ssid=${ssid%\"}
	echo "${ssid}"
}

_get_ap_mac_address()
{
	_iwconfig_get 3
}

_get_channel()
{
	_iwconfig_get 2
}

iwconfig_report()
{
	local m="connected to"
	local ssid="$(_get_ssid)"
	local mac="$(_get_ap_mac_address "${iface}")"
	[ -n "${mac}" ] && mac=" at ${mac}"
	local wep_status="$(iwconfig_get_wep_status "${iface}")"
	local channel="$(_get_channel)"
	[ -n "${channel}" ] && channel="on channel ${channel} "

	eindent
	einfo "${IFACE} ${m} \"${ssid}\"${mac}"
	einfo "${channel}${wep_status}"
	eoutdent
}

iwconfig_get_wep_key()
{
	local mac="$1" key=
	[ -n "${mac}" ] && mac="$(echo "${mac}" | sed -e 's/://g')"
	eval key=\$mac_key_${mac}
	[ -z "${key}" ] && eval key=\$key_${SSIDVAR}
	echo "${key:--}"
}

iwconfig_user_config()
{
	local conf=
	eval set -- \$ifconfig_${SSIDVAR}
	for conf in "$@" ; do
		ifconfig "${IFACE}" ${conf}
	done
}

iwconfig_set_mode()
{
	local x= opt= unopt="hostap adhoc"
	case "$1" in
		master|hostap) unopt="adhoc" opt="hostap" ;;
		ad-hoc|adhoc) unopt="hostap" opt="adhoc" ;;
	esac
	for x in ${unopt} ; do
		ifconfig "${IFACE}" -mediaopt ${x}
	done
	for x in ${opt} ; do
		ifconfig "${IFACE}" mediaopt ${x}
	done
}

iwconfig_setup_specific()
{
	local mode="${1:-master}" channel=
	if [ -z "${SSID}" ]; then
		eerror "${IFACE} requires an SSID to be set to operate in ${mode} mode"
		eerror "adjust the ssid_${IFVAR} setting in /etc/conf.d/net"
		return 1
	fi

	iwconfig_set_mode "${mode}" || return 1

	SSIDVAR=$(shell_var "${SSID}")
	local key=$(iwconfig_get_wep_key)

	# Now set the key
	ifconfig "${IFACE}" wepkey "${key}"

	ifconfig "${IFACE}" ssid "${SSID}" || return 1

	eval channel=\$channel_${IFVAR}
	# We default the channel to 3
	ifconfig "${IFACE}" channel "${channel:-3}" || return 1

	iwconfig_user_config
	iwconfig_report "${iface}"
	return 0
}

iwconfig_associate()
{
	local mac="$1" channel="$2" caps="$3"
	local mode= w="(WEP Disabled)" key=

	SSIDVAR=$(shell_var "${SSID}")
	key=$(iwconfig_get_wep_key "${mac}")
	case "${caps}" in
		[EI]P*)
		if [ "${key}" = "-" ] ; then
			ewarn "WEP key is not set for \"${SSID}\""
			return 1
		fi
		;;
		"") ;;
		*)
		if [ "${key}" != "-" ] ; then
			key="-"
			ewarn "\"${SSID}\" is not WEP enabled"
		fi
		;;
	esac

	# Set mode accordingly
	case "${caps}" in
		*E*)
		mode="managed"
		if LC_ALL=C ifconfig "${IFACE}" | \
			grep -q "^[[:space:]]*media: .*adhoc" ; then
			ifconfig "${IFACE}" down -mediaopt adhoc up
		fi
		;;
		*I*)
		mode="adhoc"
		if ! LC_ALL=C ifconfig "${IFACE}" | \
			grep -q "^[[:space:]]*media: .*adhoc" ; then
			ifconfig "${IFACE}" down mediaopt adhoc up
		fi
		;;
		*)
		if LC_ALL=C ifconfig "${IFACE}" \
			| grep -q "^[[:space:]]*media: .*adhoc" ; then
			mode="adhoc"
		else
			mode="managed"
		fi
		;;
	esac

	if [ "${key}" = "-" ] ; then
		ifconfig "${IFACE}" wepmode off
	else
		ifconfig "${IFACE}" wepmode on
		ifconfig "${IFACE}" deftxkey 1
		w=$(iwconfig_get_wep_status)
	fi

	ebegin "Connecting to \"${SSID}\" in ${mode} mode ${w}"

	if ! ifconfig "${IFACE}" wepkey "${key}" ; then
		eerror "Invalid WEP key ${key}"
		return 1
	fi

	ifconfig "${IFACE}" ssid "${SSID}" || return 1
	iwconfig_user_config

	if [ "${SSID}" != "any" ] && type preassociate >/dev/null 2>/dev/null ; then
		veinfo "Running preassociate function"
		veindent
		( preassociate )
		local e=$?
		veoutdent
		if [ ${e} -eq 0 ] ; then
			veend 1 "preassociate \"${SSID}\" on ${IFACE} failed"
			return 1
		fi
	fi

	local timeout= i=0
	eval timeout=\$associate_timeout_${IFVAR}
	timeout=${timeout:-10}

	[ ${timeout} -eq 0 ] \
	&& vewarn "WARNING: infinite timeout set for association on ${IFACE}"

	while true; do
		_has_carrier && break
		sleep 1

		[ ${timeout} -eq 0 ] && continue
		: $(( i +=  1 ))
		[ ${i} -ge ${timeout} ] && { eend 1; return 1; }
	done

	_has_carrier || { eend 1; return 1; }
	eend 0

	if [ "${SSID}"  = "any" ]; then
		SSID="$(_get_ssid)"
		iwconfig_associate
		return $?
	fi

	iwconfig_report

	if type postassociate >/dev/null 2>/dev/null ; then
		veinfo "Running postassociate function"
		veindent
		( postassociate )
		veoutdent
	fi

	return 0
}

iwconfig_scan()
{
	local x= i=0 scan= quality=
	einfo "Scanning for access points"
	eindent

	scan="$(LC_ALL=C ifconfig -v "${IFACE}" list scan 2>/dev/null | sed -e "1 d" -e "s/$/'/g" -e "s/^/'/g")"
	while [ ${i} -lt 3 -a -z "${scan}" ] ; do
		scan="${scan}${scan:+ }$(LC_ALL=C ifconfig -v "${IFACE}" scan 2>/dev/null | sed -e "1 d" -e "s/$/'/g" -e "s/^/'/g")"
		: $(( i += 1 ))
	done

	APS=-1
	eval set -- ${scan}
	for line in "$@" ; do
		: $(( APS += 1 ))
		set -- ${line}
		while true ; do
			case "$1" in
				*:*:*:*:*:*) break ;;
			esac
			eval SSID_${APS}="\"\${SSID_${APS}}\${SSID_${APS}:+ }$1\""
			shift
		done
		eval MAC_${APS}="$(echo "$1" | tr '[:lower:]' '[:upper:]')"
		eval CHAN_${APS}="$2"
		quality=${4%:*}
		shift ; shift ; shift ; shift ; shift
		eval CAPS_${APS}="\"$*\""

		# Add 1000 for managed nodes as we prefer them to adhoc
		set -- $*
		case "$1" in
			*E*) eval QUAL_${APS}=$(( quality + 1000 )) ;;
			*)   eval QUAL_${APS}=\$quality ;;
		esac
	done

	if [ -z "${MAC_0}" ]; then
		ewarn "no access points found"
		eoutdent
		return 1
	fi

	# Sort based on quality
	local i=0 k=1 a= b= x= t=
	while [ ${i} -lt ${APS} ] ; do
		: $(( k = i + 1 ))
		while [ ${k} -le ${APS} ] ; do
			eval a=\$QUALITY_${i}
			[ -z "${a}" ] && break
			eval b=\$QUALITY_${k}
			if [ -n "${b}" -a "${a}" -lt "${b}" ] ; then
				for x in MAC SSID CHAN QUALITY CAPS ; do
					eval t=\$${x}_${i}
					eval ${x}_${i}=\$${x}_${k}
					eval ${x}_${k}=\$t
				done
			fi
			: $(( k += 1 ))
		done
		: $(( i += 1 ))
	done

	# Strip any duplicates
	local i=0 k=1 a= b=
	while [ ${i} -lt ${APS} ] ; do
		: $(( k = i + 1 ))
		while [ ${k} -le ${APS} ] ; do
			eval a=\$MAC_${i}
			eval b=\$MAC_${k}
			if [ "${a}" = "${b}" ] ; then
				eval a=\$QUALITY_${i}
				eval b=\$QUALITY_${k}
				if [ -n "${a}" -a -n "${b}" ] ; then
					if [ ${a} -ge ${b} ] ; then
						unset MAC_${k} SSID_${k} CHAN_${k} QUALITY_${k} CAPS_${k}
					else
						unset MAC_${i} SSID_${i} CHAN_${i} QUALITY_${i} CAPS_${i}
					fi
				else
					unset MAC_${k} SSID_${k} CHAN_${k} QUALITY_${k} CAPS_${k}
				fi
			fi
			: $(( k += 1 ))
		done
		: $(( i += 1 ))
	done

	local i=0 e= m= s=

	while [ ${i} -le ${APS} ] ; do
		eval x=\$MAC_${i}
		if [ -z "${x}" ] ; then
			: $(( i += 1 ))
			continue
		fi

		eval m=\$MODE_${i}
		[ -n "${m}" ] && m=", ${m}"
		eval s=\$SSID_${i}
		eval q=\$QUALITY_${i}
		eval e=\$CAPS_${i}
		case "${e}" in
			[EI]P*) e=", encrypted" ;;
			*) e="" ;;
		esac
		if [ -z "${s}" ] ; then
			einfo "Found ${x}${m}${e}"
		else
			einfo "Found \"${s}\" at ${x}${m}${e}"
		fi

		x="$(echo "${x}" | sed -e 's/://g')"
		eval x=\$mac_ssid_${x}
		if [ -n "${x}" ] ; then
			eval SSID_${i}=\$x
			s=${x}
			eindent
			einfo "mapping to \"${x}\""
			eoutdent
		fi

		eval set -- $(_flatten_array "blacklist_aps_${IFVAR}")
		[ $# = 0 ] && eval set -- $(_flatten_array "blacklist_aps")
		for x; do
			if [ "${x}" = "${s}" ] ; then
				ewarn "${s} has been blacklisted - not connecting"
				unset SSID_${i} MAC_${i} CHAN_${i} QUALITY_${i} CAPS_${i}
			fi
		done
		: $(( i += 1 ))
	done
	eoutdent
	return 0
}

iwconfig_force_preferred()
{
	eval set -- $(_flatten_array "preferred_aps_${IFVAR}")
	[ $# = 0 ] && eval set -- $(_flatten_array "preferred_aps")
	[ $# = 0 ] && return 1

	ewarn "Trying to force preferred in case they are hidden"
	local ssid=
	for ssid; do
		local found_AP=false i=0 e=
		while [ ${i} -le ${APS:--1} ] ; do
			eval e=\$SSID_${i}
			if [ "${e}" = "${ssid}" ] ; then
				found_AP=true
				break
			fi
			: $(( i += 1 ))
		done
		if ! ${found_AP} ; then
			SSID=${ssid}
			iwconfig_associate && return 0
		fi
	done

	ewarn "Failed to associate with any preferred access points on ${IFACE}"
	return 1
}

iwconfig_connect_preferred()
{
	eval set -- $(_flatten_array "preferred_aps_${IFVAR}")
	[ $# = 0 ] && eval set -- $(_flatten_array "preferred_aps")
	[ $# = 0 ] && return 1

	local ssid= i= mode= mac= caps= freq= chan=
	for ssid; do
		i=0
		while [ ${i} -le ${APS} ]  ; do
			eval e=\$SSID_${i}
			if [ "${e}" = "${ssid}" ] ; then
				SSID=${e}
				eval mac=\$MAC_${i}
				eval caps=\$CAPS_${i}
				eval freq=\$FREQ_${i}
				eval chan=\$CHAN_${i}
				iwconfig_associate "${mac}" \
				"${chan}" "${caps}" && return 0
			fi
			: $(( i += 1 ))
		done
	done

	return 1
}

iwconfig_connect_not_preferred()
{
	local ssid= i=0 mode= mac= caps= freq= chan= pref=

	while [ ${i} -le ${APS} ] ; do
		eval e=\$SSID_${i}
		if [ -z "${e}" ] ; then
			: $(( i += 1 ))
			continue
		fi

		eval set -- $(_flatten_array "preferred_aps_${IFVAR}")
		[ $# = 0 ] && eval set -- $(_flatten_array "preferred_aps")
		pref=false
		for ssid; do
			if [ "${e}" = "${ssid}" ] ; then
				pref=true
				break
			fi
		done

		if ! ${pref} ; then
			SSID=${e}
			eval mac=\$MAC_${i}
			eval caps=\$CAPS_${i}
			eval freq=\$FREQ_${i}
			eval chan=\$CHAN_${i}
			iwconfig_associate "${mac}"  \
			"${chan}" "${caps}" && return 0
		fi
		: $(( i += 1 ))
	done

	return 1
}

iwconfig_defaults()
{
	# Set some defaults
	#ifconfig "${iface}" txpower 100 2>/dev/null
	ifconfig "${IFACE}" bssid -
	ifconfig "${IFACE}" ssid -
	ifconfig "${IFACE}" wepkey 1:- wepkey 2:- wepkey 3:- wepkey 4:-
	ifconfig "${IFACE}" authmode open
	ifconfig "${IFACE}" -mediaopt adhoc
	ifconfig "${IFACE}" -mediaopt hostap
}

iwconfig_configure()
{
	local x= APS=-1
	eval SSID=\$ssid_${IFVAR}

	# Setup ad-hoc mode?
	eval x=\$mode_${IFVAR}
	x=${x:-managed}
	case "${x}" in
		ad-hoc|adhoc|hostap|master) iwconfig_setup_specific "${x}" ;;
	esac

	if [ "${x}" != "managed" -a "${x}" != "auto" -a "${x}" != "ad-hoc" -a "${x}" != "adhoc" -a ${x} != "master" ] ; then
		eerror "Only managed, ad-hoc, master and auto modes are supported"
		return 1
	fi

	# Has an SSID been forced?
	if [ -n "${SSID}" ]; then
		iwconfig_set_mode "${x}"
		iwconfig_associate && return 0
		[ "${SSID}" = "any" ] && iwconfig_force_preferred && return 0

		eval SSID=\$adhoc_ssid_${IFVAR}
		if [ -n "${SSID}" ]; then
			iwconfig_setup_specific adhoc
			return $?
		fi
		return 1
	fi

	# Are we forcing preferred only?
	eval x=\$associate_order_${IFVAR}
	[ -n "${x}" ] && associate_order=${x}
	associate_order=${associate_order:-any}
	if [ "${associate_order}" = "forcepreferredonly" ]; then
		iwconfig_force_preferred && return 0
	else
		iwconfig_scan || return 1
		iwconfig_connect_preferred && return 0
		[ "${associate_order}" = "forcepreferred" ] || \
		[ "${associate_order}" = "forceany" ] && \
		iwconfig_force_preferred && return 0
		[ "${associate_order}" = "any" ] || \
		[ "${associate_order}" = "forceany" ] && \
		iwconfig_connect_not_preferred && return 0
	fi

	e="associate with"
	[ -z "${MAC_0}" ] && e="find"
	[ "${preferred_aps}" = "force" ] || \
	[ "${preferred_aps}" = "forceonly" ] && \
	e="force"
	e="Couldn't ${e} any access points on ${IFACE}"

	eval SSID=\$adhoc_ssid_${IFVAR}
	if [ -n "${SSID}" ]; then
		ewarn "${e}"
		iwconfig_setup_specific adhoc
		return $?
	fi

	eerror "${e}"
	return 1
}

iwconfig_pre_start()
{
	# We don't configure wireless if we're being called from
	# the background
	yesno ${IN_BACKGROUND} && return 0

	service_set_value "SSID" ""
	_exists || return 0

	if ! _is_wireless ; then
		veinfo "${IFACE} is not wireless"
		return 0
	fi

	iwconfig_defaults
	iwconfig_user_config

	# Set the base metric to be 2000
	metric=2000

	einfo "Configuring wireless network for ${IFACE}"

	if iwconfig_configure ; then
		service_set_value "SSID" "${SSID}"
		return 0
	fi

	eerror "Failed to configure wireless for ${IFACE}"
	iwconfig_defaults
	#iwconfig "${IFACE}" txpower 0 2>/dev/null
	unset SSID SSIDVAR
	_down
	return 1
}

iwconfig_post_stop()
{
	yesno ${IN_BACKGROUND} && return 0
	_is_wireless || return 0
	iwconfig_defaults
	#iwconfig "${IFACE}" txpower 0 2>/dev/null
}
